Chaeles batcheloe



(No Model.)

0. BATOH'ELOR.

DYNAMO ELECTRIC MACHINE.

No. 341,990. Patented May 18, 1886. W

TI'TEE UNITED STATES PATENT OFFICE.

CHARLES BATCHELOR, OF NEW YORK, N. Y.

DYNAMO-ELECTRIC MACHINE.

fidPE-JCIPICATION forming part of Letters Patent No, 341,990, dated May18, 1886.

Application filed January 20,1836. Serial No. 189,116.

To (ZZZ whom it may concern:

Be it known that I, OrrAnLns BATCHELOR, of New York city, in the countyand State of New York, have invented a certain new and usefulImprovement in Dynamo-Electric Machines, of which the following is aspecific. tion.

This invention relates to dynamo-electric machines designed to generatecurrents of high electromotive force, such as are used with series ormultiple-series systems of electric lighting. In such a machine when asudden change is made in the load, or when the external circuit isbroken, the discharge of the suddenly-demagnetized armature sometimescauses a destructive spark, which passes from one coil to another on thearmature, or from a coil to the iron core, through any ordinaryinsulation, and so injures or destroys the armature. Similar destructivesparks also may occur on the commutatorcylinder, passing from theconducting-bars to the body of the cylinder.

The object of my invention is to remedy this dilliculty by soconstructing the armature and commutator that the sparks cannot pass tothe core of the former or to the body of the latter or from one coil toanother.

In the accompanying drawings, Figure l is a cross-section of thearmature of a dynamoelectric machine embodying my invention; Fig. 2, alongitudinal section of the commutator on a much larger scale than Fig.1; Fig. 3, a cross-section of the commutator on line a: 50 of Fig. 2;Fig. 4, a cross-section on line g g of Fig. 2 and Fig. 5, an enlargedsegment of the armature cross-section.

A is one of the disks of which the armature cylinder or core iscomposed, B being the armature-shaft, and (IV a the bolts which securethe disks together.

0 O are the wires coiled longitudinally upon the armature-cylinder.

The manner of constructing the armature to accomplish the object abovenamed is as follows: I have found that the high-tension spark will notpenetrate an insulation consisting of linseed-oil or other drying-oildried up on the part to be insulated, or of paper saturated with suchoil and then dried. I there-- fore, in constructing the armature, wrapthe cylinder .A. with paper, I), which has been first (X0 model.)

dipped into boiling linseed-oil and then dried or baked thoroughly in anoven. The wire which is to be wound upon the armature, which has anyordinary insulation Z), of fibrous or similar material, is itself soakedin the boiling linseed-oil and dried, after which it is wound in theordinary manner upon the cylinder and connected to the commutatorplacedupon the same shaft. The armature thus completed is then dipped bodilyinto the receptacle of boiling linseed-oil, the commutator and connections being kept above the surface oftheliquid, and such liquid enteringbetween the wires completely fills all the interstices between thewires, and between them and the core, thus completing the thoroughinsulation of these parts in such a manner that thehigh-tension sparkcannot act in the manner described. The fine shade-lines c c areintended to represent the coating of oil.

The commutator which I use in this machine is built up as follows:

E is a metal cylinder. placed upon the shaft 13, formed with a collar,E, at its inner end, and screw-threaded, as shown at 7, at the otherend. Upon the body of the cylinder I wrap paper 0, coated withlinseed-oil, as above described.

F F are the conducting-bars, which are placed around the surface ofcylinder E. From each of these bars rises strip G, to which thearmature-wires are connected by means of connecting device l'I. Each ofthe bars F is wrapped upon its bottom and sides with linseed-oil pa per0, and between the bars are placed strips of mica f, to make a strongerand more durable wearing-surface than if the paper alone were placedbetween them. Between the ends of the bars and the collar E is a loosemetal ring, 9, which is wrapped entircl y with linseedoil paper it. Theinner side of the ring is beveled to correspond with the shape of theends of the bars. Between the bar ends and the ring 9 is placed mica 2".At the other end of the bars is placed another loose beveled ring,inwrapped with linseed-oil paper Z. Between the bars and ring 7; is micam.

I is a nut screwed upon the screw-threaded end of thecoinmutator-cylinder to secure the part-s all tightly together.

In order to prevent the bars and intermediate mica strips from turningwhen the nut is screwed on, and so being twisted out of line, I

I provide a ring, n,which has an inner lug, 0,

entering a slot in the cylinder E, so that the turning of the nut cannotcause any of the 5 other parts to turn also.

Heretofore in commutators of this character the body of the commutatorhas been provided with longitudinal slots or groovesin which theinsulating material separating the conducting-bars is placed. Strips ofsuch material have also been placed underneath each bar. \Vith thisconstruction the insulation acted to hold the bars in place, and hencethe devices just described for this purpose were not employed. \Vith thebody having a continuous surface on which the bars are laid there isnothing to prevent their displacement, and I therefore provide thedevices described. With this old construction it has been foundexceedingly difficult to thoroughly protect the parts from thehigh-tension spark or disruptive discharge when the high-tension currentis broken, the insulation notbeing continuous and the bars being broughtclose to the cylinder at points where there might be crevices betweenthe insulating parts but with the continuous wrapping which I provideupon the bars, the cylinder, and the other metal parts of materialimpenetrable by the spark,

I accomplish a complete insulation. The linseed-oil paper between thebars and cylinder prevents the spark from passing between them. Theintermediate rings, 9 and 7c, interpose such a distance between the endsof the bars and 5 those of the cylinder that the spark cannot passbetween these parts, as it might ordinarily where the bars come near tothe cylinder ends with only a narrow filling of mica between them. As anadditional safeguard,I extend the 0 mieat' a short distance abovethebars up against the radial strips G. The mica m is also made to projectabove the bars and ring 7c for the same purpose. It will be seen thatthus the whole armature and commutator are thoroughly and completelyprotected from the ill effects of the discharge-spark. As an additionalprecaution, however, I may, before wrapping the core of the armature,the .body of the commutator, and the bars and rings of the latter withthe prepared paper, cover all such parts with Japan varnish, which isbaked thereon, as shown by the heavy black lines surrounding theseparts. This may, however, be dispensed with.

I do not claim herein the method of insulating the armature by dippingit into liquid insulating material, since I am required by the PatentOllice to embody this in a separate application.

What I claim is 1. In a commutator for a dynamo-electricv machine, thecombination of a cylindrical metal body having a continuous surface, aninsulating-wrapping for said body, and condueting-bars placed thereon,substantially as 55 set forth.

2. In a commutator for a dynamo-electric machine, the combination of acylindrical metal body having a continuous surface, a wrapping for saidbody of paper impregnated with linseed or other drying oil, and conducting-bars placedthereon, substantially as set forth.

3. In a commutator for a dynamo-electric machine, the combination of acylindrical metal body having a continuous surface, aninsulating-wrapping for said body, and conducting-bars placed thereon,each having an insulating -wrapping upon its bottom and sides,'substantially as set forth. 8o

4. In a commutator for a dynamo-electric machine, the combination of acylindrical metal body having a continuous surface, a wrapping for saidbody of paper impregnated with linseed or other drying-oil, andconducting-bars placed thereon, each wrapped upon its bottom and sideswith the same material, substantially as set forth.

5. In a commutator for a dynamoelectric machine, the combination of thecylindrical 0 metal body having a continuous surface and provided with aflange at one end and a nut or screw-ring at the other, the bars restingupon the surface of said cylinder, and the loose insulated metal ringsbetween the ends of said bars and said flange and nut or ring,substantially as set forth.

6. In a commutator for a dynamo-electric machine, the combination, withthe cylindrical metal body having a continuous surface, of the barsresting upon the surface thereof, the tightening-nut or screw-ring,apdthe keyed ring between the nut and bars, substantially as set forth.

7. In a dynanlo electric machine, the combination, withthecommutator-body and the bars thereon, of the insulation at the ends ofsaid bars projecting above their surface, substautially as set forth.

This specification signed and witnessed this 142th day of January, 1886.

CHAS. BATGIIELOR.

W'itnesses:

A. \V. KIDDLE, E. O. ROWLAND.

